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TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233-0695 303-452-6111 <br />May 24, 2016 <br />Mr. Zach Trujillo <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining & Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Colowyo Coal Company L.P. <br />Permit No. C-1981-019 <br />Minor Revision No. 154 (MR -154) <br />Collom Geotechnical Drilling Program <br />Dear Mr. Trujillo, <br />�cNO) <br />R <br />MAS 2 � 2Q1� <br />Jh n D SC1d4 <br />Mlyll�v <br />Tri-State Generation and Transmission Association, Inc. (Tri-State), is the parent company to <br />Axial Basin Coal Company, which is the general partner to Colowyo Coal Company L.P. (Colowyo). <br />Therefore, Tri-State on behalf of Colowyo is submitting three (3) copies of minor revision 154 (MR -154) <br />to Permit No. C-1981-019. <br />MR -154 proposes geotechnical drill holes in and adjacent to the Collom facilities area, Collom <br />haul road, and along the existing Colowyo paved haul road. These borings are necessary to obtain data <br />for appropriate facilities and haul road design and construction. Surface disturbance associated with the <br />drilling locations will include brushing only to facilitate site access for a small track mounted rig. <br />Colowyo will be incorporating the required information related to this drilling program in Section 12 of <br />the 2016 Annual Reclamation Report in accordance with Colowyo's permit to mine commitments. <br />Colowyo anticipates a minor increase in the reclamation liability associated with this drilling <br />program. Therefore, it is requested that the Division perform the required calculation to determine the <br />increase in the reclamation liability for this submittal. <br />Also included in this revision application is a change of index sheet to ease incorporation into the <br />permit document and a revision application. If you should have any additional questions or concerns <br />please feel free to contact Tony Tennyson at (970) 824-1232 at your convenience. <br />DJC:TT:dbr <br />Enclosure <br />AN EQUAL OPPORTUNITY 1 AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy* Cooperative )1107- <br />01 <br />Sincerely, <br />Daniel J. Cas>raro <br />Senior Manager <br />Environmental Services <br />CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />CRAIG, CO $1626-1307 PREWITT, NM 87045 NUCLA, CO 81424-0698 <br />970-8244411 505-972-5200 970-864-7316 <br />